I recently picked up a Graflex Grafsonic. It has a clicker and an audio receiver. It uses a 22 1/2 volt battery. A 2 prong pigtail is connected to the reciever. I put a battery in and put an ohm meter on the prongs and when I click the clicker a circuit is completed. I can't find any info on this. Is anyone aware of when they were made, did they only fire a flash, or did they trip the shutter, etc? Any help would be appreciated.